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INGANDESGENT ELEGTRIO LAMP; No. 273,554. Patented Ma.1*.6,1883.

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(No Model.) 2 Sheets-Sheet 2. H LEA.

INGANDESGENT ELECTRIC LIAMP. No. 273,554. Patented Mar.6,1883.

F1914. Inventor.

Witn ssesQ UNITED STATES HENRY LEA, OF BIRMINGHAM, COUNTY OF VVARWIOK, ENGLAND.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 273,554, dated March 6, 1883.

Application flled- November 14, 1882. (No model.) Patented in England May 9, 188:1, No. 2,186,- in Belgium October 2, 1882 in France October 2, 1882, and in Germany October 6, 1882.

1" all whom it may concern Be it known that I, HENRY LEA, a subject l of the Queen of Great Britain, residing at Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in Incandescent Electrical Lamps,

' (tor which I have received Letters Patent in Great Britain, dated May.9, 1882, No. 2,186; in Belgium, dated October 2,1882; in France, dated October 2, 1882; in Germany, dated October 6, 1882,) of which the following is a specification.

My invention has for its object to facilitate the connecting and disconnecting of incandescent electrical lamps to and from the brackets or supports carrying them, and to simultaneously effect the connection of the carbon filament of thelamp with the disconnection of the said carbon filament from the electrical conductors by which electricity is supplied to the lamp. 1

An incandescent electrical lamp as ordinarily constructed consists of a filament of carbon inclosed within an exhausted glass globe, and connected with two platinum wires passing through the globe, the said wires serving to connect the carbon filament with external conducting-Wires which supply the current of electricity by which the filament of carbon is made incandescent. A mechanical holder carries the globe and the conducting-wires, binding-screws, and other appliances.

My improvements consist in simplifying the holder and parts connected therewith, so as to facilitate the removal and replacement of the lamp when required.

In an incandescent electrical lamp made according to my invention the hollow glass globe is surmounted by a hollow'necli, the upper end of which has the form of a transverse T- shaped head, at each extremity of which one of the aforesaid conducting-wires is brought out and bent into a small loop, which is folded down and pressed closely against the glass.- The holder consists of a body of any suitable nonconductiug material, two inetallic'spriugs, and two binding-screws. The tails of the springs are bent into such a form and placed at'such a distance apart as to grip and hold securely the head of the globe when forced up between them,and atthe same time to form metallic contact between each springand the platinum wire upon which it presses. The springs are attached to eachside of the holder near its upper end, each spring being suitably folded into notches formed in the holder, and being held in position by a binding-screw screwing into The lower por the substance of the holder. tion or tail of each spring occupies a vertical groove in the side of the holder, and a transverse groove in the bottom of the holder unites the two vertical side grooves. The width of The ob'late form of the T-shaped head prevents the possibility of inserting it into the holder in a wrong direction, and also prevents the possibility of turning the globe and the platinum loops out of contact with the springs when once the globe is in position. V

I will now proceed to describe, with reference to the accompanying drawings, the man'- ner in which my invention is to be performed. Figure 1 represents a vertical section of an incandescentelectrical lauip' constructed according to my invention, and Fig. 2 is an elevation of the same with the springs removed, the section, Fig. 1, being taken in a plane at right angles to that of the elevation, Fig. 2. The other figures represent separate parts and details of the lamp, as hereinafter explained. 7 The same letters of re ereuce indicate the same parts in several figures of the drawings. A is the exhausted gla s globe of the mean descent lamp, shown separately in elevation in Figs. 3 and 4, and plan of topiu Fig. 5. The Solid head B of the globeA contains the usual platinum wires,O G,to which are attached the two extremities of i he carbon filament D. The outer end of each. platinum wire O projects from one of the extremities or poles of the solid head B, and is ln-nt into the form of a loop, B, which is folded down close to the glass, the extreme end of the wire of the loop being caused to re-enter the glass of the solid head, as shown at d, Fig. 1, for the purpose of affording a more secure attachment. By preference the loop is made as shown in Fig. 6, and beingfolded at the dotted lines a b, the smaller loop, 0, and the end d of the wire are made to re-enter the glass of the solid head, whereby the security of the attachmentis still furtherincreased. Fig. 7 represents, on alarger scale, the configuration of the platinum wire B after it has been bent and fixed in the head B of the globe A.

The holder consists of a globular body, E. (Shown separately in sectional elevation in Fig. 8. and elevation in Fig. 9, and plan and section in Figs. 10 and 11.) The said body E is surrounded by a nearly cylindrical head, F. A transverse slot, G, in the globular body receives the solid head B of the glass globe, and four small slits, H, in the cylindrical head receive the turned-in upper ends of the springs K K. Fig. 12 represents one of these springs in front elevation, and Fig. 13 represents the same in side elevation. Fig. 14 represents a plan of the top of the spring. Fig. 15 is a sectional plan of the head of the holder, with the springs in their places on the said holder. Each of the said springs consists of a transverse head, L, bent to tit the flattened side of the nearly cylindrical head F of the holder, and hooked at I I to enter the slitsH H. The tail M of the spring is curved, as shown in Figs.1and 13, so as to fit one pole of thelamp' head B. Each spring is by preference made of two or more thicknesses of metal, whereby greater elasticity is obtained; but a single thickness may be used, if desired.

N N are two binding-screws, which serve the double purpose of securing the springs to the head of the holder and of attaching the fine wire leads or conductors O O by which the current of electricity is conveyed through the lamp.

P is a screwed stem by which the lamp may be attached to a bracket or pendant or other ornamental fitting.

In order to place the exhausted globe A of the incandescent lamp in the holder, the head B of the globe is forced between the bladesprings K K, where it is held in position by the poles of the said head entering the bows of the springs. Metallic or electrical contact is at the sametime made between each spring and the platinum wire loop, upon which it bears, and the electrical currentis thus directed through the carbon filament D in the globe A of the lamp. To withdraw the head of the globe, it is only necessary to depress it out of the holder, in doing which the head of the globe forces asunder the blade-springs and becomes liberated therefrom.

I do not limit lllyeelf to the precise form or arrangement of the parts shown in the drawings. The body of the holder, for example, may be made wholly cylindrical or wholly rectangular, or partly cylindrical, globular,

and rectangular. The expanded head L of the springs K K may be dispensed with, and the springs may be secured to the headof the holder by the binding-screws only.

Holders made according to my invention are inexpensive, and can be conveniently made by machinery, and incandescent electrical lamps having my improvements can be quickly removed and replaced even in the dark without risk of mistake or accident.

Having'now described the nature of my invention and the manner in which the same is to be performed, I wish it to be understood that I claim as my invention of improvements in incandescent electrical lamps- 1. The combination, with a holder provided with a slot and clamping or supporting devices, as specified, of the globe of an incandescentelectriclamp provided with a T-shaped head, substantially as described.

2. The combination, with the slotted holder and' clamping-springs, of the globe provided with a T-shaped head, substantially as described.

3. In combination with the globe having a solid head with flat sides and bulging ends, the holder having a slot, as described, for the reception of said head, and provided with bent springs at the open ends of said slot which clamp the bulging ends of said head when the globe is in place, substantially as described.

4. The globe for incandescentelectriclamps provided with a solid head having the conducting-wires embedded therein and leading to the interior of the globe, the upper portions of said wires passing for a suitable distance over the outer surface of said head and their extremities again entering the material whereof it is composed, substantially as described.

5. The combination of the globe having a T-shaped head, the conducting-wires projecting above the surface of said head, the slotted holder and devices thereon for making electrical contact with said wires, substantially as described.

6. The globe providedwith a solid head through which the conducting-wires pass, said wires having their outer or projecting portions looped, as explained, and pressed closely against the surface of the head and having their extremities and the ends of the loops embedded therein,in combination with a holder provided with springs adapted to clamp said head and make electrical contact with said wires, substantially as described.

7. The combination of the globe with oblong or T-shaped head, the wires leading to the interior of the globe and projecting above the surface of said head, the holder having a slot adapted to receive said head, the metal springs for embracing said head and making electrical contact with said wires and the line or main wires connec ed with said springs, substantially as described.

8. The combination of the globe having a head'and support the globe when the latter solid T-shaped head and conducting-wires is in-p1ace,-and alsomake electrical contact passing through the same and bent over it's with said wires, substantially as described.

outer surface with a holder having a slot of HENRY LEA. [L. 5.] 5 just snfficient width to admit the shorter di- Witnesses:

ameterof said head, and provided with springs GEORGE SHAW,

at the ends of said slot, which clamp said i RICHARD SKERRETT. 

